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Why not R-134a in residential AC?

Why have we not used R-134a refrigerant in residential A/c systems? I have worked on many R-12 residential systems in past years and lots of R-12 commercial systems. There must be some reasoning in going to R-410, other than the money aspect.

When the refrigerators and car Ac's are with R-134a It can be used for residential also. Only reason I could apprehend is the most of the coils / chasis for WAC are made for R-22 and probably R-410 is closer to that.

In fact for residential it is preferable to go for R-134a as it is safer and lower pressure wne compared to R-410

I am not a big follower of 410a and can not say exactly why. Perhaps, this is my rebelliousness. I just think there could be room for other choices, unless there is an oil carrying problem, capacity problem, etcetera. Considering that many mobile units have capacities equating to a 5 ton home unit, I question a capacity problem. The oil situation is still something to be considered. If I was to initiate manufacturing of a new A/C line, could I utilize, realistically, R-134a as my refrigerant? I think this is my real question.

I think its the pressures I dislike most. I was working on a water cooled indoor package unit and the condenser water flow was low so I had the head pressure at 600psi. I put gloves on when i took off my high side gauge, I didnt know if the valve core would hold back the 600psi.

I think its the pressures I dislike most. I was working on a water cooled indoor package unit and the condenser water flow was low so I had the head pressure at 600psi. I put gloves on when i took off my high side gauge, I didnt know if the valve core would hold back the 600psi.

I would rather stick to 22 or 407c or 134.

My exact reason for using service valves on my hose ends. backing the knob off closes the core without any chance of getting my fingers fried.